Image compressor for generating predicted difference code...

Details Image compressor for generating predicted difference code... Image compressor for generating predicted difference code...

2004-12-06

2008-09-02

Tran, Phuoc (Department: 2624)

Image analysis

Image compression or coding

Predictive coding

C382S233000, C382S246000, C382S251000

Reexamination Certificate

active

07421132

ABSTRACT:
An image compressor of the present invention includes a difference calculating unit and a difference requantizing unit. The difference calculating unit calculates a predicted difference between a pixel value of image data and a predicted value (a calculated value of the pixel value predicted from known data). When a magnitude of the predicted difference exceeds a predefined threshold value, the difference requantizing unit applies the coarse quantization steps to requantize the predicted difference to keep a bit range to predetermined size. In this manner, compressed data, in which a bit length of the predicted difference for one pixel is adjusted to a fixed bit length, is generated.

REFERENCES:
patent: 5341442 (1994-08-01), Barrett
patent: 5379757 (1995-01-01), Hiyama et al.
patent: 6694061 (2004-02-01), Acharya
patent: 2003-224868 (2003-08-01), None
Journal of “Interface”; No. 175, pp. 167-168; Dec. 1991.

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